I have an ad844 available
Need to change 706 sine wave to sq wave to drive my Decca class D amp
Need 7v p-p
also clean the sig up
Mal/g3kev
Sent from my iPhone
On 13 Jan 2016, at 18:16, Wolfgang Büscher <[email protected]> wrote:
>
>
> Am 12.01.2016 um 22:34 schrieb Mal Hamilton:
>> Wolf
>> What is the comparater chip u use
>> to conv 706 sine wave to sq wave
>> Mal/g3kev
> an antique NE529 (in the *switching mode linear* as described on my website).
> I only used it because it was in the junk box, but would not recommend them
> for a new design if you had to order parts. The three supply voltages are a
> plague, especially the negative 'analog' supply. Use a modern rail-to-rail
> comparator with a few nanoseconds, for example LT1016.
>
> If I was to build such a PA again, I would now use a simple linear regulator
> instead of the switching-mode DC modulator, since *most* of the time the
> output amplitude is near 'full power' anyway.
> Or use a dsPIC to provide the control signals for the RF driver and the
> modulator instead of the 'mass grave' of digital gates.
>
> 73,
> Wolf .
>
|
